Stretch film is also called elastic film. STRETCH FILM. It is a transparent, elastic and strong soft plastic film. As a new type of packaging material. It is rapidly rising in my country's packaging market.

Stretch film can be used without heating. Perform cold stretching in the longitudinal and transverse directions. At the same time, it wraps the goods and keeps the packaged goods in tension for a long time without loosening.

Stretch film can be made of PWC, E, EVA, LLDPE and other plastics. at present. Manufacturing companies have tended to focus on LLDPE base materials. Make stretch film. There are two main molding processes: flat mold method and blown film method. LLDPE used to make stretch film is mainly a linear structure polyethylene with special grades. Density is 0.910-0.925, melt index (IEI) is 1-2

1. Advantages of stretch film as packaging material

1. Can reduce packaging costs.

When packaging goods of the same volume, the amount of film used by stretch film can be reduced by 1/3 compared with shrink film. The thickness of commercially available shrink film is about 0.04~0.05m, and the film after shrink packaging is about 0.05-0.06mm; commercially available shrink film The thickness of the wrapping film is 0.02-0.03mm. The film thickness after packaging is about 0.015-0.025mm.

2. Compared with the use of ordinary packaging films, a large number of accessories (such as strapping tapes, ropes, corner protective cardboard, buckles, etc.) can be dispensed with during bundling and packaging operations. It can also simplify packaging equipment and save a lot of energy.

3. It has better safety performance. During packaging operations. No heating devices such as hot air blowers and ovens are needed. Especially for the warehousing and packaging industry, it can eliminate the use of electrical facilities in the warehouse and improve the safety factor of the warehouse.

4. Stretch film can tighten the goods into a whole and reduce the damage, collapse and loose packaging of goods during storage and transportation. One ton of palletized goods, after unified packaging. The maximum tilt angle can reach 45.

5. The goods are wrapped and packaged to be waterproof, dustproof and highly transparent. The type of packaged goods can be easily distinguished. Stretch film is non-toxic, odorless and tasteless. Can meet food hygiene performance requirements.

2. Performance of stretch film

Stretch film has good stretch properties. As the film is stretched, the load increases rapidly. When the yield point is exceeded, the film undergoes permanent deformation. The stress-strain curve is generally flat in this plastic range. Finally, the tensile load continues to increase until the rupture point is reached, at which time the load drops to zero. should say. The theoretical stress-strain curve of stretch film is similar to that of a stretched rubber band. The yield point of the latter coincides with the rupture point. so. From the fact that the rubber band can tighten the packaging, it can be inferred that the stretch film can also tighten the packaging after stretching.